Arrangement for generating high-frequency energy



June 30, 1925. 1,544,508

G. VON ARCO ARRANGEMENT-FOR GENERATING HIGH FREQUENCY ENERGY FilF'd Aug.3, 1922 Elvwewtoz GEURG. VON ARCO 33,1 his 6mm 6 ma aaJmaaiezsf I aUNITED STATES PATENT OF'F'ICIEI.

onoae vol m, OI 3mm, emnnr, ABSIGHOB TO GBW m nuan- LOSB rmemm 3mm, am,A comma v MGM! FOB G'l'mG man-Immune! Application filed Amlt a, ma.Serial 10. 519,091.

To all whom it may concern: displaced in Fhase by 90 with o to Be itknown that I, Gnome VON A300, the voltage 0 the main generator. y me- 65a citizen of the Republic of Germany, and chanical means this phaseposition may be a resident of Hallesches Ufer 12/13, Bervaried by smallamounts for the purpose of a lin S. W. 11, Germany, have invented newenabling adjustment in accordance with the and useful Improvement inArrangements different amounts of lead of the current for GeneratingHigh-Frequency Energy, of with respect to the electromotive force. Thewhich the following is a specification, actwo machines cooperate in sucha manner companied by drawings. that, generally speaking, the maingenera- |0 Heretofore, in all high frequenc mutor supplies only theenergizing component chines which supply one or a plura ity of ofthecurrent which is delivered 'to the frequency transformers, condenserswere transformer, whereas the smaller synchroused for the purpose ofkeeping the power nous generator supplies the component of factor of themachines close to unity, therethe current necessary for magnetizing. the

l by reducing the machine losses to a miniironcore of the transformer.

mum. The smaller the fundamental fre- The drawingis a diagrammaticrepresenquency of the machine, the larger and more tation of a circuitarrangement embodying expensive was the condenser necessary for theinvention. producing unitypower factor. In the illustrated arrangement,H is the 20 The invention makes possible an arrangemain generator and Ethe auxiliary genment in which stron magnetizing currents erator, therotating elements being mechaniare supplied to the requency transformer,cally connected so that they are driven toand the expensive condensersare eliminated gether. As stated, the voltage generated by withoutmaterially reducing the working the auxiliary generator may lead thevolt-' power factor of the machine. For the purage of the maingenerator.

pose of obtaining a large output, the mag- The main generator H iscoupled to the netizing current of the frequencytransfrequency'transformer F by means of choke a former must be made asstrong as possible, coil D. Auxiliary generator E is coupled because themagnetic energy stored during to the frequency transformer F by means 30each half wave of the machine is utilized of variable coupling T bymeans of which in the oscillating output circuit of the transthe voltageimpressed on the transformer F former arrangement. The oscillating cirbythe generator E can be varied, thereby 35 cuit is tuned to the desiredfrequency, which varying the phase relation of the current is a harmonicof the fundamental frequenc i and voltage of the main generator H. The35 The invention is based on the PllIlClP e output circuit of auxiliarygenerator E has of the synchronous motor which is conthe choke coil Kfor aiding the proper renected in parallel to an alternating currentlation of the voltage impressed on the input machine and is over-excitedwhile running. circuit of transformer F by the generator E. As is wellknown, such an arrangement is A switch S may also be included for open-40 a means for regulating within wide limits, ing the circuit whendesired.

depending on the excitation of the field cir- The coil D is so arrangedand the coucuit, the power factor of a circuit. The pling of coupling Tso that the phase a le difficulties arising from the necessity ofprobetween the voltage of generator H and e viding a second largemachine and from current is near zero while the phase an le as thetedious starting of such machine are between the vector sum of thevoltages oft e eliminated by the present invention. main auxiliarygenerators and the current In accordance with the present invention, iscomparatively large. 1 9 instead of a synchronous motor, a second Theoutput of the frequency transformer generator of the same frequency asthe main F is connected to circuit V which is tuned 60 generator isused. However, the second to the particular harmonic desired. Anygenerator is of smaller dimensions than the even or odd multiple may bederived from main generator, is mechanically coupled the non-sinusoidalcounter E. M. F. setupby with the main generator and its voltage is thehighly saturated frequency transformer F in a manner well known in theart and which it is not necessar to an understandin of my invention toescribe here.

y theory of the operation of the invention is as follows. The inputcircuit of the frequency transformer F has two voltages impressed on it,V,, the voltage of the main generator and V the voltage induced by meansof couplingT from the auxiliary generator E. Voltage V is made to leadV,. The resultant voltage V, obtained by adding vectorially voltages Vand V must also lead the main voltage V. The phase angle between thevoltage V and the total current I flowing thru the input circuit oftransformer F will generally be lagging and will depend on, among otherthings, the amount of magnetizing current and the phase and amount ofthe load component of current 1.

Assuming that the load component is practically in phase with theapplied voltage V, the total current I will lag the voltage V anappreciable amount on account of the amount of the magnetizing current.However, if the voltage V is lar e enough the total current I will be inphase with or actually lead the voltage V,. The above theory is not tobe construed in a limiting sense, but is inserted merely to betterexplain the operation of the invention.

Having described my invention, what I claim is:

1. An arrangement for generating high frequency energy, comprising afirst generator, an output circuit coupled to said first generator, atransformer requiring a high magnetizing current in said output circuit,a second generator, adjustable means connecting said generators togetherso that the phase relation of their generated voltages may be variedfrom 90, and means for coupling said second generator to said outputcircuit to improve the power factor in said first generator.

2. An arrangement for generating high frequency energy comprising, afirst generator,

an output circuit coupled to said first gen-- erator, a load requiring ahigh magnetizing current in said output circuit, a second generator,adjustable means connecting said generators together so that the phaserelation of their generated voltages may be varied ,from 90,andadjustable means for coupling said second generator to said outputcircuit to improve the power factor in said first generator.

3. An arrangement for generating high frequency energy comprising, afirst source of alternating voltage, an output circuit, a reactance coilfor coupling said output circuit to said first source, a load requiringa high magnetizing current in said output circuit, a second source ofalternating voltage having a phase displacement of substantially 90 withrespect to the voltage of said first source, and means for coupling saidsecond source to said output circuit to improve the power factor in saidfirst source.

4. An arrangement for generating high frequency energy comprising, afirst source of alternating voltage, an output circuit coupled to saidfirst source. a load requiring a high magnetizing current in said outputcircuit, a second source of alternating voltage having a phasedisplacement of substantially 90 with respect to the voltage of saidfirst source, and variable coupling means for coupling said secondsource to said output circuit to improve the power factor in said firstsource.

5. An arrangement for generating high frequency energy comprising analternating current main generator, a transformer in the output circuitof the main generator, a choke coil for coupling said output circuit tosaid main generator, a second generator of the same frequency as themain generator and of smaller dimensions than the main generator, saidsecond generator having a voltage phase displacement of substantially 90with respect to the voltage generated by said main generator, means formechanically connecting the second generator with the main generator foroperation simultaneously therewith and a coupling between the outputcircuit of the second generator and the output circuit of the maingenerator for improving the power factor in said main generator.

Gm GEORG vaN ARGO.

